基恩士手持如何通过JS实时获取sato蓝牙打印机的状态,目前只能在打印的时候获取到状态

代码如下：

function WaitForResponceBTPR2() {
        try {
            var printComplete = false;
            var recvBuffer = new String();
            var sendBuffer = new String();
            var objRecv = new Bt.LibDef.CommSppRecvData("");
 
            for (var loopCount = 0; loopCount < 10; loopCount++) {
                if (SPPRecv(objRecv, 1, 1) != Bt.LibDef.BT_OK) {
                    //continue;
                }
                recvBuffer = objRecv.data;
 
                // ACK receive=>Xmit ENQ and re-receive
                if (recvBuffer.charAt(0) == ACK) {
                    sendBuffer = "";
                    sendBuffer = ENQ;
 
                    if (SPPSend(sendBuffer) != Bt.LibDef.BT_OK) {
                        window.alert("error:1");
                        continue;
                    }
                }
                // NACK reception=>End response processing
 
                if (recvBuffer.charAt(0) == NAK) {
                    window.alert("error:NAK");
                    break;
                }                             
                // Check STX
                if (recvBuffer.charAt(0) != STX) {
                    loopCount = 0;
                    continue;
                }                   
                // STX reception=>Start telegram reception
 
                if (SPPRecv(objRecv, 10, 10) != Bt.LibDef.BT_OK) {
                    window.alert("error:3");
                    continue;
                }
 
                recvBuffer = objRecv.data;
                // Check ETX
                if (recvBuffer.charAt(9) != ETX) {
                    window.alert(recvBuffer.charAt(9) + 2);
                    continue;
                }                   
                // Response processing 1 (ENQ transmission)
                if ((recvBuffer.charAt(2) == "\x47") ||
                        (recvBuffer.charAt(2) == "\x48") ||
                        (recvBuffer.charAt(2) == "\x53") ||
                        (recvBuffer.charAt(2) == "\x54")) {
                    Sleep(200);
 
                    sendBuffer = "";
                    sendBuffer = ENQ;
 
                    if (SPPSend(sendBuffer) != Bt.LibDef.BT_OK) {
                        window.alert("error:5");
                        continue;
                    }
                }
                // Response processing 2
                // recvBuffer.charAt(2) 打印机状态代码,打印时获取
                if ((recvBuffer.charAt(2) != "\x00") &&
                                    (recvBuffer.charAt(2) != "\x01") &&
                                    (recvBuffer.charAt(2) != "\x41") &&
                                    (recvBuffer.charAt(2) != "\x42") &&
                                    (recvBuffer.charAt(2) != "\x4E") &&
                                    (recvBuffer.charAt(2) != "\x4D")) {                                     
 
                    continue;
                }          
                printComplete = true;
                break;
            }
 
            if (printComplete) {
                window.alert("The printing operation was completed successfully.");
                return;
            }
        }
        catch (e) {
            window.alert("error:" + e);
        }
 
        window.alert("Printing failed.");
        return;
    }